What is indicated by the color purple in USA utility markings?

The color purple in USA utility markings is specifically designated to indicate "Reclaimed Water" or "Non-potable Water." This is crucial for safety and public awareness, as reclaimed water is treated wastewater that is reused for irrigation and other non-potable uses, but is not safe for drinking.

Using purple marking helps to clearly distinguish it from potable water (which is typically marked in blue) and other utility lines, preventing accidental misuse or contamination. Safety practices in utility management stress the importance of these color codes, as they help mitigate hazards associated with the mixing of different types of water supply and inform individuals working in or around these areas, such as construction workers, of the specific utilities present underground.

This color-coding system is standardized in many regions to promote uniformity and awareness, which highlights the importance of following established utility marking guidelines in ensuring safety and public health.